Offset printing machine



June 25, 1929. F. FISCHER OFFSET PRINTING MACHINE Filed March 21, 1928 2 Sheets-Sheet l June 25, 1929.

F. FISCHER OFFSET PRINTING MACHINE F iled March 21, 1928 2 Sheets-Sheet 2 i L the impression roii h ere tinediy inotn done th W29 its htt

errsnn PRINTING trhencrnn.

hpplieetien tied ittereh ti, Mitt, itcriei the. ttiwtt, end in tterrneny .ttprit t;

I lhis invention reistes to otisetprinting inechines, i

in such printing niechines it-is hnown to neehe the otiset roii neernhie in such at ninener thnt it is either in contect with both the impression roii end the torine cyiinder or is not or contest with hoth oi seid roiis end eyiinder.

15inch .rnnchines setter troin the dised" rentsge thet the iirst prints ere not cieer due to the offset reii heinp; insuiiicientiy inhed, this reii eniy receiving sniiieient inir otter s t'ew rerohitions ot the tornie cyiinder, These priniery misprints ere reere perticnieriy tronhiesoine it on ottice oiifset printing ineehine ndspted to work sheet h y sheet from oer piie is erepiogred. i order to svoid this disedrontege ot printin eccording to the present invention ere provided whereby the odset reii een occupy o position interinedinte out the two extreme positions shove reterred to in which interine'diete position the ofit'set roii is in oontect with the iorrne cyiinderoniy so thet the seid roii prior to the insertion and printine' ot the first sheet ot' peperone he snhicienti inhedo I According to the present invention the movement oii the otiset roii into the three positions reterred to is ed'ected hy rneens ot e singie iei/er end tit-the seine time the in 'rention'setisiies the requirement es reperds ettendence ot'nn ottset printing niechine working :troin piie end intended tor nse hp nnshiiied persons" he ernhediinent ot the intention is shown rnrnnieticsiiy hp wiry ot erernpte on tee eeconipenying' drewing in which:

1 shows the errengenient in side eie retiena Q showsthe connection ot' the ott'set reii with the controiiing' ineinher ot the piie grinper a 7 it is side eieretion et en iinpre'r'ed ring tor the rnevehie oh set rotim tceerding to i i t the tornoeepiinder ed the inechine'treine. 'iihe :inerehie ottroii e is es nsnei edepted to more :treni its 'werhing; position shown in thrill tines into the position shown in dotted tines o "tor hy ineens oi e, hend ierer e pivoted on the rnechine trsine et eh the oit'set reii c toning mounted at on on ertension ot enid ieren swinging the hend ierer e into the pe d, f is eiieeted in nerei rnsnner secordi'ng to i the present invention thet the eiiset roit during its movement trein the position c into i the position c one he heid in on in' rinedie position o in which s wiii he trons drnwinp; it is on iy iii tentect with the terms cyhn n in p inting tee. icpzie this position is ntihse tor obtaining snthcient trenster out the printing iinpression :ireni the terms epiinder rt onto the eti'set" reit e whereupon the inhed otiset reiier is en ng into the end pe sition o, i. e. into the printing position. The nnshiiied eperetor is thus in e position cieeriy print the sheets pessinp' in the irnown inenner hetween the impression reii i") end the eii'set roll 0 trons the very first sheet.

'io ovoid weste oii psper owing to idie rnnmin during the thorough inking process descri ed oi the eldest reii, eccording to the present invention, the peper teed is so coupled with the movement ot the odset roii reterred to shove thst it becomes ettectire oniy et inst nieinenh thet is, when the heed ierer e occupies at predetermined position at e hetween-the positions e end 6 When in the position o es shown in 2 the tifii'iflitttttifitih in itseit itnewn, oi? e, p'ie gri per heceines etteetire,

tceerdinp; to Fig. Q the ierer it controis the hnown. piie gripper not shown in the drewing. The movement ot the toner it end wit the pits gripper eeininences we soon the member it nionnted iooseiy on the shett t eon ted with this shsttc The ineinher it oerrie eiong hy the shett t" then ectnetes e, reiier tinonnted en the toner it, I

"the conpiing .ot the member it with the t is etiected hy the movement the hired .terer e hy ot e. sniteieip cent rigidiy connected therewith which ht" rnesns oi e ierer n reeves e sieere e on which is e projecting pin p which one :teii into epertnre g on the member it,

it nerei teeters tor offset printing; r chines more pertienieri r tor ottice use is t ed'eeting oi this eonpiing movement wit, the heed ilerer e is in the position 6 Fig. 1..

tin iinprored heerinp; shown in Fig prorided eiso tor the ottset roii. in this titt hit

the

urer and s represeht rigid stops ta bearing block controlled bya spring uiand limited in its movements by such stops, the bore of tended entry of a thick mass of papenbetween the impression roll 6 and the offset roll a, on the entry of a foreign body between the forme cylinder (2; and the offset roll 0, the hearing will yield and thus prevent breakage.

It will be apparent that the roll 0 could be held stationary and the cylinder a and roll I; be made movable, but, this, however, is not so practicable.

What I claimis 1. An offset printing machine comprising a forme cylinder, an offset roll, an impression roll, 'agleyei' pivoted on the machine, an extension on thelever onwhich the oifset ioll into contact with said cylinder and out of contact with said impression roll.

,2: In an ofiset printing-machine in which the offset roll is movable so that in one position it is'in contact with the forme cylinder and .with the impression roll and in another position it is out of contact with said tylinder and roll, means for moving the offset roll into a position in which it is in contact with the forme cylinder: and out of contact with the impressionroll and a spring mounting whereby the ofi'setroll can yield and prevent breakages.

In testimony whereof I aflixm y signature.

I FERDINAND FISCHER. 

